First slide

The 3 equation for uniform acc

Question

A particle is moving along a straight line with constant acceleration. At t = 0, its velocity is 1 m/s, at t = 10 second its velocity is 5 m/s. Then its velocity at t = 20 second is

Easy

A
10 m/s
B
20 m/s
C
9 m/s
D
15 m/s

Solution

Using v=u+at we can write 5 = 1 + 10.a $\Rightarrow a = \frac{2}{5} m / s^{2}$
$T h e r e f o r e v_{20} = 1 + \frac{2}{5} \times 20 m / s = 9 m / s$

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